CVE-2026-64392 Affecting linux-6.12 package, versions <6.12.100-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published7 Aug 2026
- disclosed25 Jul 2026
Introduced: 25 Jul 2026
CVE-2026-64392 (opens in a new tab)How to fix?
Upgrade Echo:latest linux-6.12 to version 6.12.100-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: use opener credentials for delete-on-close
Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks.
Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.
References
- https://advisory.echohq.com/cve/CVE-2026-64392
- https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d
- https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d
- https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0
- https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9
- https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b